发表机构
Universität Innsbruck; Vrije Universiteit Amsterdam（因斯布鲁克大学; 阿姆斯特丹自由大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究在腔集成离子阱中实现了5个共囚禁离子量子比特的多秒相干性，验证了离子-光子纠缠的多秒存储能力，为构建多量子比特囚禁离子量子处理器网络奠定了基础。
AI 中文摘要
可扩展量子网络需要以快于退相干消除纠缠的速率产生远程纠缠，这要求节点兼具高效光-物质界面与长相干时间。腔耦合囚禁离子是极具潜力的网络节点平台，可实现光子的高效率提取。本研究报告了腔集成离子阱中量子比特寄存器的多秒相干性：首先，对自旋基态采用动力学去耦技术，将5个共囚禁离子量子比特的相干时间延长至多秒量级；其次，腔收集的离子-光子纠缠可在这些受保护的离子存储态中可靠存储数秒；第三，研究表明，离子存储量子比特对共囚禁离子产生的超1000个腔光子具有鲁棒性，其退相干受激光串扰限制；最后，经估算，适度改进并复制的离子-腔系统可在两个远程离子寄存器间同时建立多个远程贝尔对，为构建多量子比特原型囚禁离子量子处理器网络迈出重要一步。
英文摘要
Scalable quantum networks require generating remote entanglement faster than decoherence erases it, calling for nodes that combine efficient light-matter interfaces with long coherence times. Cavity-coupled trapped ions are a promising platform for network nodes, offering high-efficiency extraction of photons. Here, we report multi-second coherence for a qubit register in a cavity-integrated ion trap. First, using dynamical decoupling on spin ground states, the coherence times of five co-trapped ion qubits are extended into the multi-second regime. Second, cavity-collected ion-photon entanglement is faithfully stored in these protected ion-memory states for multiple seconds. Third, we show that ion-memory qubits can be robust to the generation of over a thousand cavity photons by a co-trapped ion, with decoherence limited by laser crosstalk. Finally, we estimate that a modestly improved and duplicated ion-cavity system could enable the simultaneous establishment of multiple remote Bell pairs between two remote ion registers, representing a step toward networking multi-qubit prototype trapped-ion quantum processors.
